Subresource Integrity (SRI) hash

The SRI Hash Generator is a tool used to generate Subresource Integrity (SRI) verification hashes. It can produce cryptographic hash strings based on the content of JavaScript, CSS, or other static resource files, which are used for integrity verification of frontend web resources.

These hash values are typically included in the integrity attribute of HTML, for example:

<script src="https://cdn.example.com/app.js"
        integrity="sha384-...."
        crossorigin="anonymous"></script>

When the browser loads the resource, it automatically verifies whether the file content matches the hash, thereby determining whether the resource has been tampered with.

Who defines SRI?

SRI (Subresource Integrity) is a standard defined by the W3C (World Wide Web Consortium) as part of the Web security specification. It has been adopted by multiple browser vendors and is considered a modern web security best practice. It is used to prevent CDN or third-party resources from being executed by the browser after being tampered with.

Use cases of SRI Hash

1. Prevent resource tampering (integrity verification)

When using CDN or third-party resources, the browser verifies whether the file content matches the SRI hash. If the resource has been modified or malicious code has been injected, the browser will refuse to load it.

2. Supply chain security

Ensures that external JavaScript or CSS files match exactly the version used when the hash was generated, preventing third-party dependencies from being tampered with during transmission or storage.

3. Improve overall web application security

In high-security scenarios such as financial systems, e-commerce platforms, and enterprise backends, SRI is an important mechanism for mitigating risks from external scripts.

4. Use with CDN

When loading popular frontend libraries via CDN (such as React, Vue, or jQuery), SRI can be used to verify that the remote file matches the expected version, improving trustworthiness.